US9529209B2 - Blur compensation device, lens barrel, and camera device - Google Patents

Blur compensation device, lens barrel, and camera device Download PDF

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Publication number
US9529209B2
US9529209B2 US14/323,555 US201414323555A US9529209B2 US 9529209 B2 US9529209 B2 US 9529209B2 US 201414323555 A US201414323555 A US 201414323555A US 9529209 B2 US9529209 B2 US 9529209B2
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axis
blur compensation
blur
drive
compensation device
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US20140313583A1 (en
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Kenta Nakamura
Toshihisa Tanaka
Takayuki Shinohara
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Nikon Corp
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Nikon Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/15—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture

Definitions

  • the present invention relates to a blur compensation device, a lens barrel, and a camera device.
  • the blur compensation device has an asymmetrical shape of a movable member with respect to a center of a lens thereof.
  • the center of the lens and a gravity center of the movable member hardly correspond to each other.
  • a voice coil motor (VCM) was placed so that a drive axis of the voice coil motor which drives a movable member was directed to a center of a lens. Therefore, in conventional arts, there was a problem that a rotary torque was worked around a gravity center of the movable member when the movable member was to move, so that control performances of the blur compensation device such as controlling stability or convergence properties of the movable member for a target position were adversely acted on during the blur compensation. In addition, there was a problem that a mass of the movable member increased and drive performances deteriorated in the case of using an adjusting member of the gravity center.
  • the object of the present invention is to provide a blur compensation device with excellent control performances, a lens barrel, and a camera device comprising the blur compensation device.
  • the blur compensation device ( 100 ) of the present invention comprises;
  • a movable member ( 130 ) provided with a blur compensation member, which is relatively movable to a fixed member ( 140 ) on a predetermined drive face, for compensating an image blur formed by an optical system and having a gravity center located different from a center of the blur compensation member (L 3 );
  • At least a part of the first drive member ( 132 , 142 ) is provided on the movable member ( 130 ) and moves with the movable member ( 130 ) along the first axis (X′);
  • the second drive member ( 134 , 144 ) is provided on the movable member ( 130 ) and moves with the movable member ( 130 ) along the second axis (Y′);
  • an intersection point (M) of the first axis (X′) with the second axis (Y′) is located nearer to the gravity center (G) of the movable member ( 130 ) than the center (O) of the blur compensation member (L 3 ) on the drive face.
  • FIG. 1 is a schematic block diagram of a camera according to one embodiment of the present invention.
  • FIG. 2 is a front side perspective view of the blur compensation device shown in FIG. 1 .
  • FIG. 3 is a back side perspective view of the blur compensation device shown in FIG. 2 .
  • FIG. 4 is an assembly drawing of the blur compensation device shown in FIG. 2 and FIG. 3 .
  • FIG. 5 is a controlling block diagram showing an example of controlling of the blur compensation operation by the camera shown in FIG. 1 .
  • FIG. 6( a ) to FIG. 6( c ) show a positional relation of a detection part, a movable part, and a holding part of blur compensation device shown in FIG. 3 to FIG. 5 , and a relation between detection axes of the detection part and drive axes of a VCM.
  • FIG. 7 shows a relation between the detection axes of the detection part and the drive axes of the VCM when the movable part is moved along the X-axis.
  • FIG. 8 shows a relation between the detection axes of the detection part and the drive axes of the VCM when the movable part is moved along Y-axis.
  • FIG. 9 is a graph showing a relation between KK factor and stationary deviation regarding a moving amount of the movable part.
  • FIG. 10 is a graph showing a relation between KK factor for an inclined angle of the drive axis of the VCM and the distance between a gravity center of a movable part and an origin of the VCM drive axes.
  • FIG. 11 is a diagram of frequency response of the blur compensation device according to the present invention.
  • FIG. 12 is a conceptual diagram for determining a positional direction of the movable part with respect to the gravity direction.
  • FIG. 13 is a graph showing a relation between a positional direction of the movable part and an electric power consumption of the VCM.
  • FIG. 14( a ) and FIG. 14( b ) show directions of optimal positions of the movable part.
  • FIG. 15 shows a positional relation of a detection part, a movable part and a holding part, and a relation between the detection axes of the detection part and the drive axes of the VCM in a blur compensation device according to the conventional arts.
  • FIG. 16 is a diagram of frequency response of the blur compensation device according to the conventional arts.
  • a camera 1 is a so-called compact digital camera, and a camera body 1 a and a lens barrel 2 are integrated.
  • a compact digital camera will be described as an example, but the present invention is not limited to the compact digital camera.
  • it may be a single-lens reflex digital camera which constitutes a lens and a camera body separately.
  • it may be a mirrorless type camera which excludes a mirror mechanism.
  • it is not limited to a compact digital camera or a single-lens reflex digital camera, but it can be also applied to optical devices such as video cameras, binoculars, microscopes, telescopes, or mobile phones.
  • the lens barrel 2 comprises an imaging optical system constituted by arranging a first lens group L 1 , a second lens group L 2 , and a third lens group (a blur compensation lens group) L 3 in order from a subject side.
  • the camera 1 of the present embodiment comprises an image sensor 3 represented by CCD or CMOS at the back of the third lens group (image surface side).
  • the first lens group L 1 is provided at the nearest to the subject side in the imaging optical system.
  • the first lens group L 1 is movably driven by a drive mechanism 6 in the direction along the optical axis L and can ensure zooming.
  • the second lens group L 2 is movably driven by a drive mechanism 8 in the direction along the optical axis L and can ensure focusing.
  • the third lens group (the blur compensation lens group) L 3 comprises a part of a blur compensation device 100 .
  • the blur compensation lens group L 3 moves within a face crossing the optical axis L and decreases image blurs caused by the camera motion.
  • a diaphragm mechanism 4 is driven by a drive mechanism 10 so that camera exposure is controlled.
  • the image sensor 3 generates an electrical image output signal based on light of the subject image formed by the imaging optical mechanism on the imaging face.
  • the image output signal is inputted to the CPU 14 after A/D conversion or noise processing with a signal processing circuit 16 .
  • An angle velocity sensor 12 such as gyro sensors is built in with the lens barrel 2 .
  • the angle velocity sensor 12 detects an angle velocity caused by hands movement etc. occurring to the camera 1 and outputs it to the CPU 14 .
  • a detecting signal from a AF sensor 18 is also outputted to the CPU 14 . Based on the detecting signal, the drive mechanism 8 is controlled and an auto focus (AF) function is realized.
  • AF auto focus
  • a storage medium 20 , a nonvolatile memory 22 , and some kind of operation button 24 etc. are connected to the CPU 14 .
  • the storage medium 20 is a memory such as an attachable card type memory which stores camera images and is read out by receiving an output signal from the CPU 14 .
  • an attachable card type memory such as Compact Flash (a registered trademark) cards or SD cards, but it is not particularly limited.
  • the nonvolatile memory 22 stores information of adjusted values such as gain values of gyro sensors and is comprised of a semiconductor memory which is built in with inside of the camera with the CPU 14 .
  • a release switch is exemplified as some kind of operation button 24 and a signal thereof is inputted to the CPU 14 by depressing the release switch half or completely.
  • an axis parallel to the optical axis L is Z-axis.
  • the blur compensation device 100 comprises a movable part 130 and a fixed part 140 .
  • the fixed part 140 comprises a shutter part 110 and a position detection part 120 . These are fixed to the fixed part 140 at screws 150 .
  • the shutter part 110 has a constitution of controlling camera exposure and may be independent from the fixed part 140 .
  • the position detection part 120 comprises a first hall effect element 122 and a second hall effect element 124 and detects a position of the movable part 130 .
  • the first hall effect element 122 has a detection axis on X-axis vertical to the optical axis L and the second hall effect element 124 has a detection axis on Y-axis vertical to the optical axis L.
  • the first hall effect element 122 and the second hall effect element 124 detect magnetic fields of a first magnet 132 and a second magnet 134 which are provided on the movable part 130 and detect the position of the movable part 130 .
  • the movable part 130 comprises the first magnet 132 , the second magnet 134 , and the blur compensation lens group L 3 .
  • the blur compensation lens group L 3 will be described as one slide of the blur compensation lens L 3 .
  • the movable part 130 is attached to the fixed part 140 at the three points by three pulling coil springs 145 .
  • the pulling coil springs 145 are attached to between a spring installation part at the side of the fixed part 146 shown in FIG. 3 and a spring installation part at the side of the movable part 136 shown in FIG. 4 .
  • the movable part 130 By sliding among three ceramic balls 148 shown in FIG. 4 , the movable part 130 relatively moves to the fixed part 140 on a face crossing the optical axis L (e.g. a face including X-axis and Y-axis and/or a face crossing the optical axis L orthogonally).
  • the number of the pulling coil springs 145 and the ceramic balls 148 can be changed properly in accordance with shapes of the movable part 130 and the fixed part 140 and the like.
  • the movable part 130 moves on a face crossing the optical axis L by the driving force generated by the interaction between the first magnet 132 (the second magnet 134 ) provided on the movable part 130 and the first drive coil 142 (the second drive coil 144 ) provided on the fixed part 140 .
  • the first magnet 132 and the first drive coil 142 comprise a first VCM 152
  • the second magnet 134 and the second drive coil 144 comprise a second VCM 154 .
  • VCM is an abbreviation of voice coil motors.
  • the blur compensation device 100 further comprises a target position command generating part 162 , a subtracter 164 , a feedforward controller 166 , a feedback controller 168 , and an adder 170 .
  • a target position command generating part 162 the blur compensation device 100 further comprises a target position command generating part 162 , a subtracter 164 , a feedforward controller 166 , a feedback controller 168 , and an adder 170 .
  • These constitution may be included in, for example, the CPU 14 of a camera body 1 a shown in FIG. 1 or by a lens CPU (not expressed with a Figure) of the lens barrel 2 .
  • An angle velocity sensor 12 is included in the camera 1 shown in FIG. 1 .
  • the angle velocity sensor 12 detects blur angle velocity signals ⁇ p and ⁇ y (rad/s) in the pitch direction and the yaw direction generated to the camera 1 and outputs them to the target position command generating part 162 .
  • the target position command generating part 162 generates signals regarding movable part target position x t and y t (mm) by converting the angle velocity signals ⁇ p and ⁇ y to blur angles ⁇ p and ⁇ y (rad) by integrating them and by projecting blur angles ⁇ p and ⁇ y on a face crossing the optical axis.
  • the signals regarding movable part target position x t and y t are signals regarding a target position of the movable part 130 for cancelling a blur due to the angle velocity signals ⁇ p and ⁇ y .
  • coil drive electric currents I x and I y (A) for driving coils 142 and 144 are generated.
  • the signals regarding the movable part target position x t and y t are inputted to the adder 170 through the feedforward controller 166 . Further, the signals regarding the movable part target position x t and y t and signals regarding movable parts position coordinates x and y are inputted to the adder 170 through the subtracter 164 and the feedback controller 168 . By utilizing these inputted signals, the adder 170 generates the coil drive electric currents I x and I y and outputs them to the first VCM 152 (the first drive coil 142 ) and the second VCM 154 (the second drive coil 144 ).
  • the hall effect elements 122 and 124 shown in FIG. 5 detect movable parts position coordinates x and y and output them to the feedback controller 168 .
  • blur compensation is proceeded by repeating the above control with the angle velocity sensor 12 and the blur compensation device 100 .
  • mutually vertical axes on the face of X, Y-axes vertical to the optical axis L are A1-axis and A2-axis.
  • A1-axis and A2-axis pass the optical axis L on the face vertical thereto and are mutually vertical.
  • the A1-axis and A2-axis divide an angle, which X-axis and Y-axis cross at the optical angle L, into the two same angles.
  • the first hall effect element 122 and the second hall effect element 124 are placed on the detection part 120 .
  • the first hall effect element 122 has a detection axis in the direction of X-axis and the second hall effect element 124 has a detection axis in the direction of Y-axis.
  • X-axis and Y-axis are mutually vertical, but they may cross at an angle which is not perpendicular.
  • the first hall effect element 122 detects a X-axis directional position of the first magnet 132 attached to the movable part 130 shown in FIG. 6( b ) and the second hall effect element 124 detects a Y-axis directional position of the second magnet 134 .
  • the detection part 120 provided with the first hall effect element 122 and the second hall effect element 124 can thereby detect a positional coordinate along X-axis and Y-axis of the movable part 130 .
  • the movable part 130 has an asymmetrical shape along A1-axis. This is because, as shown in FIG. 2 and FIG. 4 , from the viewpoint of downsizing of the blur compensation device 100 etc., the shutter part 110 is integrated into the blur compensation device 100 and an approximately half area of lower side of the fixed part 140 is occupied by the shutter part 110 . Therefore, the gravity center G of the movable part of the movable part 130 does not exist at the center O of the lens but exist at the upper side of the center O of the lens along A2-axis. Note that, the shape of the movable part 130 may have a symmetrical shape along A1-axis and may have an asymmetrical shape along A2-axis as well.
  • the movable part 130 is provided with the first magnet 132 and the second magnet 134 .
  • the electromagnetic driving forces F x′ and F y′ are acted on to the movable part 130 .
  • X′-axis is inclined toward X-axis at a drive axis inclined angle ⁇
  • Y′-axis is inclined toward Y-axis at a drive axis inclined angle ⁇ .
  • the intersection point of X′-axis with Y′-axis is the origin M of drive axis.
  • the movable part 130 moves relatively to the fixed part 140 along X′-axis and Y′-axis.
  • the center O of the lens passes the optical axis L.
  • the first magnet 132 is placed so that the center thereof passes X′-axis and the second magnet 134 is placed so that the center thereof passes Y′-axis.
  • the first drive coil 142 and the second drive coil 144 are placed on the fixed part 140 . That is, the first drive coil 142 is placed on the fixed part 140 , as shown in FIG. 6( c ) , so that X′-axis which is a drive axis of the first VCM 152 comprised of the first drive coil 142 and the first magnet 132 shown in FIG. 6( b ) passes nearer to the gravity center G of the movable part than the center O of the lens.
  • the first drive coil 142 is placed so that the VCM drive axis X′ is inclined toward the hall effect element detection axis X at the drive axis inclined angle ⁇ (deg).
  • the second drive coil 144 is placed on the fixed part 140 so that Y′-axis which is the drive axis of the second VCM 154 comprised of the second drive coil 144 and the second magnet 134 passes nearer to the gravity center G of the movable part than the center O of the lens. That is, the second drive coil 144 is placed so that the VCM drive axis Y′ is inclined toward the hall effect element detection axis Y at the drive axis inclined angle ⁇ (deg). Note that, the inclined angle of X′-axis toward X-axis and the inclined angle of Y′-axis toward Y-axis may be different.
  • the placement position may be adjusted so that X′-axis and Y′-axis pass nearer to the gravity center G of the movable part than the center O of the lens.
  • the drive axis origin M which is an intersection point of the drive axis X′ with the drive axis Y′ exists nearer to the gravity center G of the movable part than the center O of the lens along A2-axis.
  • the drive axis origin M preferably corresponds to the gravity center G of the movable part.
  • the drive axis X′ and the drive axis Y′ cross at an angle of ⁇ 0 which is not perpendicular and the angle of ⁇ 0 is an obtuse angle (e.g. an angle of 91-degrees to 120-degrees) in the present embodiment.
  • the VCM drive axes X′ and Y′ are inclined toward the hall effect element detect axes X and Y at the drive axis inclined angle ⁇ . Therefore, as shown in FIG. 7 , which is a case that the drive axis origin M corresponds to the gravity center G of the movable part, when a driving force F x′ is acted on along the drive axis of the first VCM 152 , the driving force F x′ is vectorially resolved to a driving force F x′x of X-axis directional component and a driving force F x′y of Y-axis directional component of the hall effect element detection axes.
  • the driving force F x′x of X-axis directional component is used as a driving force for a target position x t of the movable part shown in FIG. 5 , while the driving force F x′y of Y-axis directional component adversely acts on convergence to a target position y t of the movable part.
  • the driving force F x′y is canceled by acting a driving force F y′ on Y′-axis with the second VCM 154 . That is, the driving force F x′y is canceled by a driving force F y′y of Y-axis directional component of the driving force F y′ . In this case, the following relation is held between the driving force F x′y and the driving force F y′y .
  • i and j are unit vectors in the directions of X-axis and Y-axis, respectively.
  • the target driving force F x of X-axis direction to the target position x t of the movable part is represented by the numerical formula 5.
  • the following numerical formula 8 is obtained in the same way as the above when the movable part 130 is converged to the target position of the movable part y t by acting the driving force F y′ on the movable part 130 along the drive axis Y′ of the second VCM 154 .
  • the driving force F x′ of the first VCM 152 on X′-axis is represented by the following numerical formula 9-1 by means of the driving forces F x and F y in the X and Y direction of the hall effect element detection axis.
  • the numerical formula 9-1 is represented by the following numerical formula 9-2 by means of F x′ , F x , and F y .
  • the driving force F y′ of the VCM on Y′-axis is represented by the following numerical formula 10-1.
  • the numerical formula 10-1 is represented by the following numerical formula 10-2 by means of F y′ , F x , and F y .
  • the blur compensation device 100 of the present embodiment is dynamically modeled and control performances of the blur compensation device will be described.
  • control in the X-axis direction will only be described. Since control in the Y-axis direction is the same as control in the X-axis direction, control in the Y-axis direction will be omitted.
  • a displacement of the movable part 130 in the x-direction is x (mm)
  • a rotation angle around Z-axis passing the gravity center G of the movable part is ⁇ GZ (rad)
  • the mass of the movable part 130 is m (kg)
  • the moment of inertia around Z-axis passing the gravity center G of the movable part is J GZ (kg ⁇ mm 2 )
  • a driving force in the X-axial direction from the VCM 142 is f X (N)
  • a gap of the gravity center (the distance between the drive axis origin M and the gravity center G of the movable part) is ⁇ (mm)
  • a gap between the gravity center and the hall effect element 122 is B (mm)
  • a composed spring constant in X-direction by the pulling coil springs 145 is k x (N/m)
  • a composed viscosity coefficient in X-direction therewith is c x (N ⁇ s/m)
  • a motion of the movable part 130 along x-axial direction is represented by an equation of motion as shown in the following numerical formula 11 and numerical formula 12.
  • An equation of motion regarding translation of the position of the gravity center of the movable part 130 is represented by the numerical formula 11 and an equation of motion regarding rotation of the position of the gravity center of the movable part 130 is represented by the numerical formula 12.
  • a displacement X Sensor (s) (mm) in the X-axial direction which the hall effect element detects is represented by a numerical formula 15 from the above numerical formula 13 and numerical formula 14.
  • f s (s) is represented by a numerical formula 16.
  • ⁇ m and ⁇ j represent natural angular frequencies (rad/s) in the translation direction (X-axial direction) and the rotation direction (rotation around the Z-axial direction passing the gravity center G of the movable part), respectively.
  • ⁇ m and ⁇ J represent damping ratios ( ⁇ ) (dimensionless numbers) of the translation direction and the rotation direction, respectively.
  • the first paragraph represents a transfer function in the translation direction and the second paragraph represents a transfer function in the rotation direction.
  • the transfer function represents a transfer function from the movable part to the hall effect element and does not include control parts or the VCM parts.
  • m ⁇ B/J GZ is an important parameter in discussing the control performances of the blur compensation device according to the present invention. This is defined as KK factor and represented by a numerical formula 18.
  • polarity of KK factor is determined by a relation between the direction of the gap ⁇ between the gravity center and the driving force F x and the direction of the gap B between the gravity center and the hall effect element position. That is, in FIG. 6( b ) and FIG. 6( c ) , when X-axis and X′-axis are out of alignment in the same direction toward the gravity center G of the movable part, a value of KK factor is positive and the transfer function regarding the blur compensation part 100 is stable.
  • the first VCM 152 and the second VCM 154 are placed so that the drive axis origin M shown in FIGS. 6( a ) to 6( c ) exists nearer to the gravity center G of the movable part than the center O of the lens, and that the intersection point of X-axis with Y-axis and the drive axis origin M are out of alignment in the same direction toward the gravity center G of the movable part.
  • the drive axis origin M exists between the center O of the lens and the gravity center G of the movable part.
  • FIG. 9 shows a relation of a deviation of a position reference of the center of the lens in response to values of KK factor after a predetermined period of time regarding a displacement of the movable part in a step response.
  • the deviation is small and control performances are excellent in the area whose values of KK factor are close to 0, and the deviation is large and control performances are poor in the area whose values of KK factor are negative.
  • KK factor is set so that it is in a positive area and the value of the deviation is D1 or less.
  • the deviation D1 is a 70% value of a maximum peak value D2 of the deviation. Therefore, the value of KK factor in the present embodiment is 0 or larger and 0.2 or less.
  • the distance ⁇ between the drive axis origin M and the gravity center G of the movable part and the value of KK factor are controlled by adjusting the drive axis inclined angle ⁇ . That is, the drive axis inclined angle ⁇ is adjusted so that the drive axis origin M is located nearer to the gravity center G of the movable part than the center O of the lens and/or the value of KK factor is 0 or larger and 0.2 or less.
  • FIG. 10 shows a relation between the drive axis inclined angle ⁇ and the distance ⁇ (and KK factor).
  • the horizontal axis is a drive axis inclined angle ⁇ (deg)
  • the vertical axis on the left side is a distance ⁇ (mm)
  • the vertical axis on the right side is KK factor
  • the distance ⁇ is represented by plots of a black square shape
  • KK factor is represented by plots of a black diamond shape.
  • the distance ⁇ and KK factor vary at the drive axis inclined angle ⁇ of ⁇ to + ⁇ .
  • the distance ⁇ is 0 when the drive axis inclined angle ⁇ is ⁇ 1 .
  • the drive axis origin M corresponds to the gravity center G of the movable part.
  • the drive axis origin M exists nearer to the gravity center G of the movable part than the center O of the lens.
  • KK factor is 0 or larger when the drive axis inclined angle ⁇ is ⁇ 1 or less and KK factor is 0.2 or less when the drive axis inclined angle ⁇ is ⁇ 4 or larger. That is, KK factor is 0 or larger and 0.2 or less in the range R2 ( ⁇ 4 ⁇ 1 ).
  • the drive axis inclined angle ⁇ is preferably adjusted in the range R3 ( ⁇ 3 ⁇ 1 ) which satisfies the condition of the range R1 and the condition of the range R2. This is because, by adjusting the drive axis inclined angle ⁇ in the range R3, a rotation component can be suppressed and a stable control can be performed in the movement of the movable part.
  • the drive axis inclined angle ⁇ is adjusted to ⁇ 1 so that the distance ⁇ between the drive axis origin M and the gravity center G of the movable part is close to 0 and KK factor is positive (in this case, as is evidenced by the numerical formula 18, the value of KK factor is also close to 0) in the above-mentioned range R3.
  • KK factor is positive (in this case, as is evidenced by the numerical formula 18, the value of KK factor is also close to 0) in the above-mentioned range R3.
  • the drive axis origin M which is an intersection point of X′-axis that is a drive axis of the first VCM 152 with Y′-axis that is a drive axis of the second VCM 154 is placed nearer to the gravity center G of the movable part 130 than the center O of the lens of the blur compensation optical member L 3 . Therefore, since the drive axis origin M of the movable part 130 can be close to the gravity center G of the movable part 130 , a rotation component which is a harmful effect in the movement of the movable part 130 can be suppressed and a translation component which is effective for the movement of the movable part 130 can be efficiently functioned.
  • the drive axis origin M preferably corresponds to the gravity center G of the movable part and the effect of the rotation component can be completely removed in this case. Therefore, in the present embodiment, convergence properties of the movable part 130 into the target position and control stability of the movable part 130 and the like can be improved, and control performances of the blur compensation device 100 can be improved. Further, since the effect of the rotation component can be completely removed without using an adjusting member of the gravity center etc., drive performances can be maintained without increasing the mass of the movable part.
  • FIG. 11 The control performances of the blur compensation part 100 according to the present embodiment is shown in FIG. 11 and they will be compared with the control performances of the conventional art ( FIG. 15 ) shown in FIG. 16 .
  • FIG. 11 and FIG. 16 show board diagrams representing gain/phase of outputting toward inputting.
  • the inputting is an acceleration acted by an electromagnetic driving force which drives the movable part and the outputting is a position of gravity center of the movable part.
  • the conventional art shown in FIG. 15 has a resonance component at a frequency H 1 (Hz). This is because, in the conventional art shown in FIG. 15 , the drive axis of the VCM is placed toward the center of the lens and a rotation torque around the gravity center of the movable part is generating.
  • the resonance component does not occur.
  • the first hall effect element 122 is located at a position including an intersection point of X-axis with X′-axis and the second hall effect element 124 is located at a position including an intersection point of Y-axis with Y′-axis.
  • the center of the first hall effect element 122 is placed at the intersection point of X-axis with X′-axis and the center of the second hall effect element 124 is placed at the intersection point of Y-axis with Y′-axis.
  • both the first hall effect element 122 and the second hall effect element 124 output a positional information corresponding to 0.
  • the drive axis origin M exists between the center O of the lens and the gravity center G of the movable part.
  • the value of KK factor regarding the transfer function of the blur compensation device is thereby positive. Therefore, the blur compensation device according to the present invention can be controlled stably.
  • the movable part 130 since the movable part 130 is controlled by utilizing blur angular velocity signals ⁇ p and ⁇ y detected by the blur detection part 12 and the movable part position coordinates x and y detected by the first hall effect element 122 and the second hall effect element 124 , the movable part 130 can be converged at the acute target position.
  • the blur compensation device can be preferably controlled.
  • the second embodiment of the present invention is the same as the first embodiment except that the arrangement of the blur compensation device 100 toward the gravity direction is different from that of the first embodiment. In the following description, some part overlapped by the above embodiment will be omitted.
  • the electric power consumption P (W) in driving the first VCM 152 and the second VCM 154 is represented by the following numerical formula 28.
  • the inclined angle ⁇ of the gravity and the electric power consumption P have a relation shown in FIG. 13 . That is, the electric power consumption P is smallest when the inclined angle ⁇ of the gravity is 0 (deg) or 180 (deg). On the contrary, the electric power consumption P is largest when ⁇ equals 90 (deg). From this, as shown in FIG. 14 , the electric power consumption for supporting the movable part 130 is smallest when the movable part 130 is placed so that ⁇ equals 0 or ⁇ equals 180.
  • the first VCM 152 and the second VCM 154 are arranged with respect to the movable part 130 so that the gravity direction is directed to inside of an acute angle ⁇ 5 among angles formed by crossing X′-axis and Y′-axis.
  • the first VCM 152 and the second VCM 154 shown in FIG. 6 are arranged with respect to the movable part 130 so that a bisector of the acute angle ⁇ 5 consisted of X′-axis and Y′-axis is directed to the gravity direction.
  • the driving force can be efficiently acted on to the movable part 130 by utilizing the gravity or cancelling the gravity.
  • FIG. 14( a ) shows an example of arrangement of the blur compensation device 100 (a movable part 130 ) of the camera 1 .
  • the camera 1 comprises a release switch 24 at the upper part thereof and a photographer using the camera 1 often uses it in the state of the release switch 24 directing to the upper part.
  • the bisector of the angle ⁇ 5 of the blur compensation device 100 so that it is directed to the gravity direction, the electric power consumption of the blur compensation movement can be reduced and the entire electric power consumption of the camera 1 can be reduced.
  • the above embodiments describe a blur compensation device of an optical-system moving type which drives the blur compensation lens L 3 shown in FIG. 1 and the present invention can be applied to a blur compensation device of an image-sensor moving type which moves the image sensor 3 shown in FIG. 1 .
  • the two VCMs are employed as a means of driving the movable part, but the present invention is not limited to this.
  • two or more VCMs may be employed.
  • Other actuators such as piezoelectric actuators may be also used.
  • the two hall effect elements are employed as a means of detecting a position of the movable part, but the present invention is not limited to this. Two or more hall effect elements may be employed. Further, other position detection measures such as PSD sensors may be used as well.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Studio Devices (AREA)
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JP2012000282A JP2013140252A (ja) 2012-01-04 2012-01-04 ブレ補正装置、レンズ鏡筒および撮影装置
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PCT/JP2012/084128 WO2013103137A1 (ja) 2012-01-04 2012-12-28 ブレ補正装置、レンズ鏡筒および撮影装置

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WO2013103137A1 (ja) 2013-07-11
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CN104040420A (zh) 2014-09-10
CN109683345A (zh) 2019-04-26
CN109683345B (zh) 2021-04-16

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